Remove barely-used cmMakefile::AddCacheDefinition

The boolean overload of this method was used only to implement option().
We re-implement option() in terms of the main method and removes the
now-unused signature.  This removes some duplicate code that had already
fallen behind on changes (it was not removing the local definition
instead of setting it).

Source/cmMakefile.cxx

@@ -1720,23 +1720,6 @@ void cmMakefile::AddDefinition(const char* name, bool value)
 #endif
 }
 
-
-void cmMakefile::AddCacheDefinition(const char* name,
-                                    bool value,
-                                    const char* doc)
-{
-  bool val = value;
-  cmCacheManager::CacheIterator it =
-    this->GetCacheManager()->GetCacheIterator(name);
-  if(!it.IsAtEnd() && (it.GetType() == cmCacheManager::UNINITIALIZED) &&
-     it.Initialized())
-    {
-    val = it.GetValueAsBool();
-    }
-  this->GetCacheManager()->AddCacheEntry(name, val, doc);
-  this->AddDefinition(name, val);
-}
-
 void cmMakefile::RemoveDefinition(const char* name)
 {
   this->Internal->VarStack.top().Set(name, 0);

Source/cmMakefile.h

@@ -294,8 +294,6 @@ public:
    * Add bool variable definition to the build. 
    */
   void AddDefinition(const char* name, bool);
-  ///! Add a definition to this makefile and the global cmake cache.
-  void AddCacheDefinition(const char* name, bool, const char* doc);
 
   /**
    * Remove a variable definition from the build.  This is not valid

Source/cmOptionCommand.cxx

@@ -69,9 +69,7 @@ bool cmOptionCommand
     {
     initialValue = args[2];
     }
-  this->Makefile->AddCacheDefinition(args[0].c_str(),
-    cmSystemTools::IsOn(initialValue.c_str()),
-    args[1].c_str());
-
+  this->Makefile->AddCacheDefinition(args[0].c_str(), initialValue.c_str(),
+                                     args[1].c_str(), cmCacheManager::BOOL);
   return true;
 }